Dual-Band Slot Dipole Antenna Fed by a Coplanar Waveguide

Abstract

A modified slot dipole antenna fed by a coplanar waveguide for dual-frequency operation is presented. This antenna is formed by placing an additional slot dipole parallel to the coplanar waveguide-fed inductive slot dipole antenna, and inserting between them a pair of slot apertures shorter than the two slot dipoles. By varying the lengths of the protruded portions of these two slot dipoles, two operating frequency bands can be obtained. The tuning range of the frequency ratio of the two resonant frequencies is between 1.3 and 2.5. The proposed antenna possesses similar and well-behaved radiation performances in the two operating bands.